The T in the name indicates that it is for designed for shooting in tungsten lighting situations. Essentially indoors with incandescent bulbs. Slide film of that age is probably going to come out monochrome blue or red. lt might be scannable but will be worthless for projecting

It might be fun for us and cross processing, or processing with C 41 chemicals. The lomo kids might even buy it off of you if you hand roll it in charge 3 or 4 $ a roll

You'd probably have better luck trying to hatch a petrified dinosaur egg. Expect a blaaah image and a lot of crossover in the highlights. But maybe just as a fun experiment. It was decent stuff in its day, with a tad more latitude and better color balance than daylight films, though I
personally preferred Fuji 64T.

Usually when manufacturers give you an oddball ISO like that, I think it's because of filtration. When you put a #85 filter on it to use it in daylight, you get a nice rounded 50 ISO. So basically it's a 50D film and 64T. Same with 160T.

Edit: Actually I might be wrong about this. Does 85 take more than 1/3 stops?

Custom first developer can restrain all fog and give much more decent slides than standard processing with old E-6 film. But I find a lot of these older Kodak slide films are not worth it due to poor grain and poor resolution and sharpness compared to what we have now (even when new).